arch/blackfin/lib/cache.c

   1 /*
   2  * U-boot - cache.c
   3  *
   4  * Copyright (c) 2005-2008 Analog Devices Inc.
   5  *
   6  * (C) Copyright 2000-2004
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  *
   9  * Licensed under the GPL-2 or later.
  10  */
  11
  12 #include <common.h>
  13 #include <asm/blackfin.h>
  14 #include <asm/mach-common/bits/mpu.h>
  15
  16 void flush_cache(unsigned long addr, unsigned long size)
  17 {
  18         void *start_addr, *end_addr;
  19         int istatus, dstatus;
  20
  21         /* no need to flush stuff in on chip memory (L1/L2/etc...) */
  22         if (addr >= 0xE0000000)
  23                 return;
  24
  25         start_addr = (void *)addr;
  26         end_addr = (void *)(addr + size);
  27         istatus = icache_status();
  28         dstatus = dcache_status();
  29
  30         if (istatus) {
  31                 if (dstatus)
  32                         blackfin_icache_dcache_flush_range(start_addr, end_addr);
  33                 else
  34                         blackfin_icache_flush_range(start_addr, end_addr);
  35         } else if (dstatus)
  36                 blackfin_dcache_flush_range(start_addr, end_addr);
  37 }
  38
  39 #ifdef CONFIG_DCACHE_WB
  40 static void flushinv_all_dcache(void)
  41 {
  42         u32 way, bank, subbank, set;
  43         u32 status, addr;
  44         u32 dmem_ctl = bfin_read_DMEM_CONTROL();
  45
  46         for (bank = 0; bank < 2; ++bank) {
  47                 if (!(dmem_ctl & (1 << (DMC1_P - bank))))
  48                         continue;
  49
  50                 for (way = 0; way < 2; ++way)
  51                         for (subbank = 0; subbank < 4; ++subbank)
  52                                 for (set = 0; set < 64; ++set) {
  53
  54                                         bfin_write_DTEST_COMMAND(
  55                                                 way << 26 |
  56                                                 bank << 23 |
  57                                                 subbank << 16 |
  58                                                 set << 5
  59                                         );
  60                                         CSYNC();
  61                                         status = bfin_read_DTEST_DATA0();
  62
  63                                         /* only worry about valid/dirty entries */
  64                                         if ((status & 0x3) != 0x3)
  65                                                 continue;
  66
  67                                         /* construct the address using the tag */
  68                                         addr = (status & 0xFFFFC800) | (subbank << 12) | (set << 5);
  69
  70                                         /* flush it */
  71                                         __asm__ __volatile__("FLUSHINV[%0];" : : "a"(addr));
  72                                 }
  73         }
  74 }
  75 #endif
  76
  77 void icache_enable(void)
  78 {
  79         bfin_write_IMEM_CONTROL(IMC | ENICPLB);
  80         SSYNC();
  81 }
  82
  83 void icache_disable(void)
  84 {
  85         bfin_write_IMEM_CONTROL(0);
  86         SSYNC();
  87 }
  88
  89 int icache_status(void)
  90 {
  91         return bfin_read_IMEM_CONTROL() & IMC;
  92 }
  93
  94 void dcache_enable(void)
  95 {
  96         bfin_write_DMEM_CONTROL(ACACHE_BCACHE | ENDCPLB | PORT_PREF0);
  97         SSYNC();
  98 }
  99
 100 void dcache_disable(void)
 101 {
 102 #ifdef CONFIG_DCACHE_WB
 103         bfin_write_DMEM_CONTROL(bfin_read_DMEM_CONTROL() & ~(ENDCPLB));
 104         flushinv_all_dcache();
 105 #endif
 106         bfin_write_DMEM_CONTROL(0);
 107         SSYNC();
 108 }
 109
 110 int dcache_status(void)
 111 {
 112         return bfin_read_DMEM_CONTROL() & ACACHE_BCACHE;
 113 }